Transmission device



Afig; 18, 1942; F. v. WALTZ TRANSMISSIGN imvzcm Fild' July 31, 1941- 2Sheets-Sheet 1 23 I 4 fbsfer Z Wa/fz INVENTOR A TORNEYS F. V. ,WALTZTRANSMISSION DEVICE Aug. 18, 1942.

Filed July 31, 1341 2 Sheets-Sheet? Fasfer l Va/fz INVEN'TOR BY Z aATTORNEYS Patented Aug. 18, 1942 UNITED STATES PATENT OFFICE,

12 Claims.

This invention relates to variable speed transmission devices, and moreparticularly to means for mounting such transmission devices to enabletheir use in any position relative to the driving machines.

The use of intertelescoping dual sheave pulleys in variable speedtransmissions has been somewhat limited, due to the types of mountingbrackets which have heretofore been used. It is desirable that such avariable speed transmission be so constructed that it can be used tochange the speeds between, for example, a motor and a machine arrangedin vertical relationship, horizontal relationship or, as in the case ofa drill press, with the central axes of the motor and the machine bothvertical and in horizontal spacial relation.

In a variable speed transmission employing a composite dual sheavepulley, the driving belt and driven belt are engaged between the wallsof two outer cone-shaped flanges and a central shiftable doublecone-shaped flange. The speed of the driven machine is changed by movingthe pulley toward or away from the machine. This tightens one or theother of the belts and forces the shiftable double cone-shaped centralmember to move longitudinally on its axis. The tightened belt thencontacts the walls of its V-shaped sheave nearer the axis of rotationand the other belt is moved out from the center. when such a lateralshift of the center member takes place, the vertical planes of contactof the belts are moved in the same direction as the center member andthe center lines of the belts are no longer at right angles to the axesof the pulley and the driving and driven machines. Therefore the beltsdo not enter the pulleys cleanly and excessive wear results.

To assure that the belts enter the pulleys cleanly, the composite pulleymay be mounted upon a shaft which is translatable at an angle oblique toits axis so that the shift of the belts on the faces of the sheaves willbe compensated for by shifting the lateral position of .the compositedual sheave pulley.

In order to construct a variable speed transmission which is designedfor use in various positions the composite pulley must be so mountedthat it will not interfere with the mounting of the transmission as awhole and can be moved obliquely with respect to its axis whether suchaxis be vertical or horizontal and whether the belts extend from thepulleys vertically or horizontally.

The indication of speed change through the However,

use of such a variable speed transmission has often been accomplished byhaving a scale marked on a stationary portion of the mechanism and anindicator attached to a sliding portion of the mechanism. Where thespeed transmission is of the usual type, and is designed for use withone particular machine, such a speed change indicating scale issatisfactory since the speed on the one machine needs to be shown inonly one way; that is, revolutions per minute, or proper speeds forcertain drill sizes or ratios of driving to driven speeds. If, however,such a transmission were designed to permit universal mounting andapplications to various machines, it would be impossible to mark all ofthese scales, as well as others which might be interesting, on the bodyof the mechanism itself.

It is the principal object of this invention to provide a mounting for avariable speed change transmission which will permit the speed changetransmission to be used with the line of drive arranged Vertically orhorizontally, and between two axes arranged either vertically orhorizontally, or in either vertical or horizontal spacial relation ifhorizontally parallel.

It is a further object of this invention to provide a mounting for avariable speed transmission which can be mounted on a horizontal surfaceor on a vertical. surface,

It is another object of this invention to provide a variable speedtransmission mounting means which will compensate for the lateral shiftof the belt center, lines caused by the shifting of the center member ofa composite dual More specific objects and advantages are apparent fromthe description, in which reference is had to the accompanying drawingsillustrating a preferred form of transmission device embodying theinvention.

In the drawings:

Fig. I is a vertical sectional view of a speed change transmissionembodying the inventiont Fig. II is a fragmentary view in verticalelevation of the device illustrated in Fig. I, taken on the line II-IIof Fig. I.

Fig. III is a horizontal, cross-sectional view, taken on the lineIII-III of Fig. I, a pinion and shaft being shown in plan.

Fig. IV is a view in elevation on a smaller scale of the deviceillustrated in Fig. I, showing the operating handle in one of itsvarious positions.

Fig. V is a plan view of the device illustrated in Fig. I, installed inanother position, and showing the incorporation therewith of a speed.scale.

Fig. VI is a view in elevation of the device shown in Fig. I in stillanother of its installations. a e t Fig. VII is a fragmentary detailedview of a portion of the speed scale shown in Fig. V;

Fig. VIII is a plan view of the universal mounting bracket shown in usein Figs. IV, V and VI.

These specific drawings and the specific description that follows merelydisclose and illustrate the invention and are not intended to im-' poselimitations upon the claims.

Rotatably mounted upon a shaft ['9 is a double sheave pulley I I. Thepulley H consists of a sleeve l2, concentric with the shaft In, twooutside flanged members l3 and I4, formingthe outer surfaces of thesheaves, and a sl'idable double cone-shaped member I5. The flangedmembers I3 and M are fixedly attachedto the sleeve l2 through hubs l6and II respectively.

Ball bearings 18 and 19 are mounted on the shaft I0 and permit thepulley to rotate thereon. The inner end of the shaft l0 extends throughan angularly bored, angular faced .cylihdricalplug 20 which is fittedinto a plate H, which plate is slidable in a channel on one side of abase 22. The base 22 (Fig. III) has a longitudinal channel 23 cut in oneof its sides, and a second longitudinal channel 24 cut in its otherside. The shaft l0 extends through a slot 25, cut through the base 22between the channels 23 and 24. A second angularly bored, angular facedcylindrical plug 26 is mounted in a rack plate 2'! which is slidable inthe channel 24. The shaft l9 extends through this second plug 26 and hasa threaded section 28 on which is mounted a collar 29. t

The collar 29 is held on the threaded section 28 by means of a retainingnut 39. A forked clamping lever 3| is pivoted near the ends of its forkson the collar 29. The endsof the forks of the clampinglever 3| are cutwith a small radius which, when the clamping lever 3| is swung intocoaxial relation with the shaft l9, cams against the angular face of theplug 26 and tightens the collar 29 against the retaining nut 33, whichsqueezes the plugs 20 and 216 together and clamps the plate 2| and therack plate 21 in the channels 23 and 24.

A bearing bracket 32 is fastened to the base 22, by means of screws 33,and serves to rotatably support a pinion shaft 34.. A pinion 35 is fixedon one end of the shaft 34 and a handwheel 33 is fixed to the other end.The pinion 35 is in mesh (Fig. II) with side teeth 31 of the rack plate21.

The base 22 has the general shape of the frustum of a wedge, withparallel faces and sides and plane surface ends which, if extended,would converge in a line. The sides of the base are trapezoidal inshape, resulting in the ends ofthe base 22 being at an angle from thevertical (in relation to the faces) equal to -approximately one half ofthe angle which the faces of the member 15 make with a plane "at rightangles to the axis of the shaft I0. As shown in Fig. I, this anglecompensates for the angular boring in the plugs 20 and 26 in order tomake the shaft l0 horizontal when the base 22 is mounted on end.

The angular relation between the shaft i0 and the base 22 is necessaryto maintain belts 38 and 39 on the same driving line when the member I5is moved to one side or the other. If the belt 38 is assumed to be thedriving belt, and the belt 39 the driven belt, the position of thetransmissioh in Fig. I will result in a low driven speed. If

' the clamping lever 3| is swung away from coaxial relation with theshaft l0 and the mechanism released, by turning the handwheel 35 in acounterclockwise direction, the rack plate 21 may be moved downwardlycarrying the pulley H therewith. Increased tension on the belt 39, and aloosening of tension on the belt 38, will force the member IE to theleft, increasing the driving diameter of the pulley and decreasing thedriven diameter. This will, of course, increase the speed of the drivenmachine. If the'movement of the pulley II were vertical, rather than atthe angle determined by the angularly bored plugs 20 and 26 and theangular end of the base 22, the center line of both belts would beshifted to the left. However, since the angle of mounting of the pulleyis approximately one quarter the angle of intersection of the faces ofthe pulley, the pulley is shifted to the right as it is lowered,compensating for the movement of the belt to the left on the flangedmembers [3 and I4 and maintaining the belts on the same driving line.

In Figs. I, II and III, the bearing bracket 32 is shown mounted on thefront of the base 22 with the pinion shaft 34 extending horizontally atright angles to the plane of movement of the shaft H). The base 22 isconstructed with several series of tapped holes spaced to receive thescrews 33 through the bearing bracket 32. The rack plate 21 has sideteeth 31 and also has teeth 40 in one of its edges. Thus the bearingbracket 32 may be mounted as shown in Figs. I, II and III with thepinion engaging the teeth 37, or may be mounted in holes 4| (Fig. II)with the rack plate 21 reversed in which case the pinion 35 would meshwith the teeth 40. There is a similar set of holes drilled at rightangles to those in which the screws 33 are driven in the arrangementshown in Fig. II and another pair of holes 4! is at right angles to; theholes 4|.

The channels 23 and 24 are of the same width and depth so that the rackplate 2! can be mounted on either side of the base 22.

In Fig. I, the baseis shown mounted on end with mounting screws comingup through the table or bench, onwhich it is mounted, into a pair ofholes 42. The base is constructed with similar pairs of mounting holes,having the same center-to-center distances, in both ends, both sides andnear both sides on both faces. The pairs of holes 42, bored mine ends ofthe base, are bored at right angles to the face of the ends. Similarlythe pairs of holes 42, bored in the edges of the base, are bored atright angles to those edges. However, the pairs of holes bored in thefaces of the base are bored at the same angle as that on which the endsof the base are cut, can be seen in Fig. VI.

Fig. IV shows the mechanism mounted on end on a mounting bracket 43which is in turn bolted to the bench or table, on which the machine ismounted. In Fig. IV, the bearing bracket 32 is shown attached to theedge of the base 22 and the rack 35 is in mesh with the teeth 45 in theedge of the rack plate 21. The rack plate 21 is on the opposite side ofthe base 22 from that on which it is shown in Fig. I.

The mounting bracket 43 (Fig. VIII) has a pair of holes 44 which havethe same center-to-center distance as the various pairs of tapped holes42 in the base 22. The mounting bracket 43 also has three slots 45 withtheir principal axes at the same angle to the center lines of the holes44 as that angle at which the shaft III is mounted in the base 22.

Fig. V illustrates the mechanism with the base 22 mounted on its edge onthe mounting bracket 43. Since the slots in the mounting bracket 43 areto permit adjustment of the speed change mechanism toward and away fromthe machine and the motor, and since the base 22 must be mounted at anangle to the line of drive of the belts, as can be seen in Fig. V, theslots 45 must be constructed at the same angle to the line of centers ofthe holes 44 and the longitudinal axis of the base 22 when mountedthereon.

In Fig. V, the bearing bracket 32 is mounted on the face of the base 22and the pinion 35 is in mesh with the side teeth 31 of the rack plate21.

In Fig. VI, the base 22 is mounted on its face with the shaft lextending vertically. In order to maintain the shaft ID in a verticalposition, and to mount the base 22 at the proper angle to shift thepulley II when it is moved along the base 22, two Wedge-shaped basespacers 46 and 41 are mounted between the face of the base 22 and themounting bracket 43.

In Fig. V, there is shown attached to the transmission, a universalspeed scale which is necessitated by the universality of the mountingbracket and the transmission base. This speed scale consists of a tube48 (Fig. VII), having an annular flange 49 in which is cut a groove Thetube 48 is mounted in a bracket 5| and held therein by a set screw 52,which extends into the groove 55. The tube 48 has a plurality oflongitudinal apertures 53 cut in its walls, and, marked on the outersurface of the tube, are scales 54, in various terms, one for each ofthe apertures 53. The tube 48 is rotatable within the bracket 5| andthus the desiredscale 54 and corresponding aperture 53 may be moved intoline with an indicating arrow or arrows 55 marked on the periphery of aplunger 56 slidable within the tube 43. The plunger 55 is attached toone end of a Bowden wire cable 51. the other end of which is attached tothe base 22 (Fig. V) and the rack plate 21. Thus the variable scale maybe mounted in any position relative to the transmission and the movementof the rack plate T! will be reflected by the indicating plunger 56 toshow the change in speed in terms of whichever of the scales 54 isturned to View.

The embodiment of the invention that has been disclosed may be modifiedto meet various requirements.

Having described my invention, I claim:

1. In a device of the class described, in com bination, a base havingoppositely directed elongated faces and edges, a, shaft translatablymounted on said base for movement in a direction oblique to its axis,means for moving said shaft including a slide movable in said base andhaving a set of rack teeth in one of its faces, said teeth extending toan edge of a face of said slide and a set of rack teeth in the side ofsaid slide adjacent such edge, a control shaft bearing bracket mountableon said base adjacent the path of movement of said slide on either sideof either face of said base and on either edge of said base and acontrol shaft upon which is fixed a pinion engageable in either of saidsets of rack teeth, said control shaft being mountable in said bearingbracket to extend perpendicularly from the plane of said base in eitherdirection and on either side of said base and to extend parallelly tothe plane of said base and perpendicularly to its edges in eitherdirection and on either side of said base, a composite dual sheavepulley journaled by said translatably movable shaft and engageable by adriving and driven belt, said shaft being removably mounted on saidslide and adapted to extend from either side of said base, and means forclamping said slide in a selected position.

2. In a device of the class described, in combination, a rectilinearbase, a shaft translatably mounted on said base for movement in adirection oblique to its axis, means for moving said shaft including aslide movable in said base and having a set of rack teeth in one of itsfaces, said teeth extending to an edge of such face and a set of rackteeth in the side of said slide adjacent such edge, a control shaftbearing bracket mountable onsaid base adjacent the path of movement ofsaid slide on either side of either face of said base and on either edgeof said base and a control shaft upon which is fixed a pinion engageablein either of said sets of rack teeth, a composite dual sheave pulleyjournaled by said translatably movable shaft and engageable by a drivingand a driven belt, said shaft being removably mounted on said slide andadapted to extend from either side of said base, and means for clampingsaid slide in a selected position.

3. In a device of the class described, in combination, a rectilinearbase, a shaft translatably mounted on said base for movement in adirection oblique to its axis, means for moving said shaft including aslide movable in said base and having a set of rack teeth in one of itsfaces, said teeth extending to an edge of such face and a set of rackteeth in the side of said slide adjacent such edge, a control shaftbearing bracket mountable on said base adjacent the path of movement ofsaid slide on either side of either face of said base and on either edgeof said base and a control shaft carrying a pinion engageable in eitherof said sets of rack teeth, a composite duel sheave pulley rotatablyjournaled by said shaft and engageable by a driving and a driven belt,said shaft being removably mounted on said slide and adapted to extendfrom either side of said base, said translatably movable shaft extendingthrough said slide to that side of said slide opposite from saidcomposite dual sheave pulley, and a clamping and locking member attachedto the end of said translatably movable shaft and acting against saidslide to lock said slide in a selected position in said base.

4. In a device of the class described, in combination, a composite dualsheave pulley for changing the speed ratio between a driving and adriven belt, each engaged in a sheave of said pulley, a base, a shafttranslatably mounted on said base for movement in a direction oblique toits axis, a slide movable in said base for moving said shaft, variablypositionable means for moving said slide, said pulley being journaled bysaid shaft and mounted on one end of said shaft, said shaft beingremovably mounted on said slide and adapted to extend from either sideof said base, said translatably movable'shaft extending through saidslide to that side of said slide 0pposite from said composite dualsheave pulley, and a clamping and locking member attached to the end ofsaid translatably movable shaft and acting against said slide to locksaid slide in a selected position in said base.

5. In a variable speed transmission of the type comprising a compositedual sheave pulley for changing the speed ratio between a driving and adriven belt each engaged in a sheave of said pulley, a substantiallyrectilinear base, a shaft translatably mounted on said base for movementin a direction oblique to its axis by which said composite dual sheavepulley is journaled, variably positionable means for moving said shaftincluding a control shaft adapted to be mounted in said means to extendfrom either side of said base or from either face of said base, the endsof said base being cut at an angle with relation to the face of saidbase complementary to the angle between the direction of movement ofsaid shaft and the axis of said shaft when mounted in said base, saidbase being mountable upon either of its ends, and means for mountingsaid base on either edge thereof or on either face thereof including abracket usable alone for mounting said base on either of its edges andspacers usable with said bracket for mounting said base on either of itsfaces.

6. In a variable speed transmission of the type comprising a compositedual sheave pulley for changing the speed ratio between a driving and adriven belt each engaged in a sheave of said pulley, a substantiallyrectilinear base having oppositely directed faces and edges, a shafttranslatably mounted on said base for movement in a direction oblique toits axis by which said composite dual sheave pulley is journaled,variably positionable means for moving said shaft including a controlshaft adapted to be mounted to extend from either side of said base orfrom either face of said base, and means for mounting said base oneither of its edges or on either of its faces, including a bracketusable alone for mountl ing said base on either of its edges and spacersusable with said bracket for mounting said base on either of its faces.

'7. In a variable speed transmission of the type comprising a compositedual sheave pulley for I changing the speed ratio between a driving anda driven belt each engaged in a sheave of said pulley, a substantiallyrectilinear base having oppositely directed faces and edges, a shafttranslatably mounted on said base for movement in a a direction obliqueto its axis by which said composite dual sheave pulley is journaled,variably positionable means for moving said shaft including a controlshaft adapted to be mounted to extend from either side of said base orfrom either face of said base, and means for mounting said base oneither of its edges or on either of its faces, including a bracketusable alone for mounting said base on either of its edges and spacersusable with said bracket for mounting said base on either of its faces,said bracket having mounting slots bearing the same angular relation tosaid base when mounted on edge on said bracket as the angle between saidbase and a plane perpendicular to the axis of said translatably movableshaft,

said spacers being adapted to be located between one face of said baseand said bracket and .to hold said base and said bracket in an angularrelation equal to such angle between said base and such planeperpendicular to the axis of said translatably movable shaft.

8. In a device of the class described, in combination, a base shapedsubstantially like the frustum of a wedge each of its faces beingsubstantially rectangular and having a longitudinally extending channeltherein, said base having a slot extending between said channels, aslide movable in either of said channels, a set of rack teeth in oneface of said slide adjacent one of its edges and another set of rackteeth in the side of said slide adjacent such edge, a bearing bracketadapted to be secured to said base at either side of either of its facesand on either of its edges, a pinion engageable in either of said setsof rack teeth and secured to a control shaft mounted in said bracket, ajackshaft removably mounted on said slide and adapted to project fromeither face thereof, a composite dual sheave pulley rotatably journaledby said jackshaft, said jackshaft extending through the slot in saidbase and through said slide, and clamping means for holding said slideand said jackshaft in an adjusted position on said base.

9. In a device of the class described, in combination, a base shapedsubstantially like the frustum of a wedge each of the faces beingsubstantially rectangular and having a longitudinally extending channeltherein, said base having a slot extending between said channels, aslide movable in either of said channels, a set of rack teeth in oneface of said slide adjacent one of its edges and another set of rackteeth in the side of said slide adjacent such edge, a bearing bracketadapted to be secured to said base at either side of either of its facesand on either of its edges, a pinion engageable in either of said setsof rack teeth and secured to a control shaft mounted in said bracket, ajackshaft removably mounted on said slide and adapted to project fromeither face thereof, an angularly bored bushing removably mounted insaid slide for mounting said jackshaft on said slide, one face of saidbushing being at right angles to the axis of said jackshaft and theother face of said bushing being parallel to the direction of movementof said jackshaft, a composite dual sheave pulley rotatably journaled bysaid jackshaft, said jackshaft extending through the slot in said baseand through said slide, and clamping means for holding said slide andsaid jackshaft in adjusted position on said base.

10. In a variable speed transmission, in combination, a composite dualsheave pulley for changing the speed ratio between a driving and adriven belt each engaged in a sheave of said pulley, a base, a shafttranslatably mounted on said base for movement in a direction oblique toits axis, said composite pulley being journaled on said shaft, and meansfor mounting said shaft on said base and for moving said shaft includinga linearly movable slide and an angularly bored bushing mountable insaid slide for removably mounting said translatably movable shaft, oneface of said bushing being at right angles to the axis of said shaft andthe other face of said bushing being parallel to the direction ofmovement of said shaft, said shaft being mountable in said bushing onsaid slide with said pulley on either side of said base.

11. In a device of the class described, in combination, a base shapedsubstantially like the frustum of a wedge each of its faces beingsubstantially rectangular and having a longitudinally extending channeltherein, said base having a slot extending between said channels, aslide movable in either of said channels, a set of rack teeth in oneface of said slide adjacent one of its edges and another set of rackteeth in the side of said slide adjacent such edge, a bearing bracketadapted to be secured to said ,base at either side of either of itsfaces and on either of its edges, a pinion engageable in either of saidsets of rack teeth and secured to a control shaft mounted in saidbracket, a jackshaft removably mounted on said slide and adapted toproject from either face thereof, a composite dual sheave pulleyrotatably journaled on said jackshaft, said jackshaft extending throughthe slot in said base and through said slide, and an adjustable clampattached to that end of said jackshaft extending through said slideopposite from said dual sheave pulley and acting against said slide toclamp said slide and jackshaft in a selected position.

12. A universally mountable variable speed transmission comprising acomposite dualsheave pulley for changing the speed ratio between adriving and a driven belt each engaged in one of said sheaves, a shafttranslatably movable in a direction oblique to its axis by means ofwhich said pulley is journaled, said shaft being adapted to extend fromeither of two opposite sides of said base and means for mounting andmoving said translatably movable shaft having a control shaft adapted toextend in any one of four directions on a plane parallel to the axis ofsaid shaft in any one of eight positions from said base.

FOSTER V. WALTZ.

